﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace WinFormsApp1
{
    //记录上一个落子点
    class Retract
    {
        //构造函数,实例化时传坐标参数
        public Retract(int X, int Y)
        {
            this.X = X;
            this.Y = Y;
        }
        //默认-1,也就是无效坐标
        public int X = -1, Y = -1;
    }
}
